Advent of Code 2020

Organization

Project contains multiple packages in a cargo workspace.

• The advent_2020 package contains Advent of Code problem solutions
• The parser package contains a simple parser combinator library that seemed rather relevant. It's a port of the F# example found on fsharpforfunandprofit.com. For any serious work you should probably consult one of the parser combinator crates on crates.io.

Notes:

• Day 13 pt 2: Particularly unpleasant to discover that I apparently should have a priori knowledge of a mathematical theorem I've never had any reason to encounter.
• Day 17 pt 1: The examples in which the "frame of view follows the active cells in each cycle" are completely unreadable to me. I couldn't write the tests I wanted and spent a number of extra minutes scratching my head because one specific unit test was failing, all the while not noticing that my test of the overall solution was already passing.
• Day 20 pt 2: Doesn't seem hard in any sense, but for some reason I struggled to get my solution working. I didn't end up altering my overall approach, but I needed a 3rd party to find which component was malfunctioning. Feels bad man.
• Day 23 pt 2: The difference between an index focused (ie terrible) approach and a label/link focused approach is incredibly huge. Release build optimizations are also nearly an order of magnitude difference in execution time, but that has little to do with my code; just an interesting sidenote.